Keystones — Capstone
Five GCSE retrieval questions · 30 June 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √550
Answer: 5√22 -
2. Algebra Completing the square
Complete the square: 4x² + 24x - 7
Answer: 4(x + 3)² - 43 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 19cm, b = 28cm, angle = 41°. Give your answer to 2 decimal places
Answer: 174.51cm² -
4. Ratio Combining two ratios
a:b is 4:5 and b:c is 7:6. Find a:b:c in its simplest form.
Answer: 28:35:30 -
5. Statistics Averages and range
Find the mean, median and range of: 75, 41, 18, 46, 12, 30, 17, 85
Answer: Mean = 40.5, Median = 35.5, Range = 73